... , HBN2. Precision Ball Screw A Ball Screw using a screw shaft ground to high accuracy. [Model number]BNK, BIF, DIK, BNFN ... and a Ball Spline groove crossing one another on a single shaft. The nuts of the Ball Screw and the Ball Spline ... , NS4. Rolled Ball Screw A Ball Screw using a screw shaft roll-formed to high accuracy. [Model number]JPF, BTK, MTF ...